Our New TT (May-2020) has a Electric/Propane water heater that has become very noisy lately. If only it were not right next to the bed. But it is and the 2' proximity with a very thin wall for seperat...
I never turn mine off when camping, but then mine isn't next to my bed, but if it were, I'd agree with the others and just turn it off before retiring. Do I assume it's only noisey when on propane ? I've never heard mine when on electric.